This is the deadly “faster-is-slower” effect, as crowd experts call it. Above a certain speed, people moving for an exit will actually get out much later than if they had moved more slowly. An arch of bodies is created around an exit as everyone tries to get out at the same time. The friction leads to a clog, which slows down the entire evacuation. Imagine trying to walk out a narrow door moving shoulder to shoulder with five other people. You would knock into one another as you tried to gain access to the opening, spending time and energy squeezing past the other bodies before even getting to
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